fixed some errors

src/dao/MemberDaoImpl.java

@@ -110,7 +110,7 @@ public class MemberDaoImpl implements MemberDao {
 			pstmt = conn.prepareStatement(sql);
 			ResultSet rs = pstmt.executeQuery();
 			while (rs.next()) {
-				if (rs.getString("email").equals(name)) {
+				if (rs.getString("email").equals(email)) {
 					System.out.println("Email already exists in the database.");
 					break;
 				}